Palo Alto Unit 42 are tracking an increasingly widespread malvertising campaign targeting macOS. This campaign appears to be the next stage of a previous campaign known as JSCoreRunner, which was first identified in August 2025. In recent months, the financially-motivated attackers behind these campaigns transitioned from delivering standard adware, to delivering adware with full backdoor capabilities. Palo Alto Unit 42 designate this campaign Operation FlutterBridge, and calls the payload that it delivers FlutterShell.
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Source: Palo Alto Unit 42
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